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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: dynaclone and triode not offering transformers posted by Tom Bavis on September 8, 2021 at 07:02:43:
I have a pair of "A470"s, bought from Triode more than 20 years ago; I just now measured the turns ratios and got:
4 ohm tap: 4190 ohms anode-anode
8 ohm tap: 4676 --- " ---
16 ohm tap: 4306 --- " ---
Primary end-end DC resistance about 200 ohms, so a reasonable guess is to add 400 ohms for a loaded transformer (the secondary DCR is more difficult to measure so I didn't). That gives 5076 ohms on the 8-ohm tap, consistent with your 5150 measurement.
So it looks like the 4300 ohm spec is for the turns ratio, not the actual tube load impedance. And the 8 ohm tap is slightly different from the others.
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- RE: dynaclone and triode not offering transformers - Paul Joppa 09/8/2114:05:43 09/8/21 (0)
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